The NC10 has an awesome battery, so there’s no reason not to treat yourself to maximum brightness while on battery. This one is thanks to the Ubuntu NC10 blog.
1) Reboot your computer, interrupting startup with F2 just after the computer turns on (you have to be quit). Set screen brightness control to user controlled instead of automatic.
2) Turn up the brightness all the while in the GRUB screen at boot. After that point you won’t be able to raise the maximum any higher.
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Gnome-power-manager can control the display brightness. To prevent it from adjusting it while working on battery, simply use gconf-editor to navigate to
apps->gnome-power-manager->backlight and set brightness_battery and brightness_dim_battery to 0.